Note that a lower drag coefficient does not mean less drag per se. The drag coefficient is a function of the body shape. Total drag is proportional to the drag coefficient AND the cross-sectional area. (And the square of the speed btw)

I'd be curious to see how the cross sectional area of the Durango compares to the JGC.

Anyone have any idea why the Durango wuld have a lower (.35) coefficient of drag (cd) than a GC (.37) ? The nose does not look as sloped.

And while I'm pontificating - you'd be surprised how counter-intuitive some aspects of the drag coefficient can be. For example, on sub-sonic rockets and planes, parabolic noses have less drag than ogival and much less than sharp noses.

The other thing that's really important is the tail shape - and there are surprises here too. Ever see people on the freeway who have replaced the tailgate on their pickup with a mesh? Believe it or not, that adds drag (counterintuitive - I know.)